\Whispering-Gallery Microlaser Using Semiconductor Nanoparticles

使用半导体纳米粒子的微激光，albert T. Rosenberger, Donna K. Bandy, Bret N. flanders，俄克拉荷马州立大学物理系，智力优势：该项目研究包覆半导体量子点的单个熔融二氧化硅微球的超低阈值激光。泵浦激光输入和微激光发射通过锥形光纤耦合在微球的低语通道模式中进出。目标是：(1)通过研究这种低阈值的起源，推进对微激光操作的理解；(2)扩展微激光操作的范围和可控性——例如，通过改变纳米粒子的大小和组成（也使用PbSe和PbS），增加HgTe和HgCdTe观察到的1240-1780 nm激光波长范围；(3)进一步发展介电泳方法，实现纳米颗粒微谐振腔的可控涂层；(4)演示这些微激光器的实际应用——例如，大气微量气体（如甲烷或一氧化碳）的传感。三个令人兴奋的新研究领域是微球共振光学增强；半导体纳米粒子的高效光发射；并利用电介质电泳将纳米颗粒定向组装到结构中。这项工作将通过促进使用量子点和低语廊模式的腔量子电动力学研究来推进基础研究。更广泛的影响：这项工作将加强与俄克拉何马州纳米结构材料网络（NanoNet）的联系。该大学的多学科光子学学位课程也将受益于该项目。纳米网络和光子学项目都从代表性不足的群体中招收学生，而pi将鼓励本科生的参与。一名共同负责人和一名研究生是代表性不足的群体的成员。所涉及的研究生将学习基本技术以及市场技能。他们还将通过会议发言和期刊出版物直接参与研究成果的传播。除了它们的基本利益之外，微激光器还有许多潜在的应用。PI与Nomadics公司签订了许可协议，Nomadics公司对开发基于微激光器的商业产品很感兴趣。

ECS-0601362Whispering-Gallery Microlaser Using Semiconductor NanoparticlesAlbert T. Rosenberger, Donna K. Bandy, Bret N. FlandersDepartment of Physics, Oklahoma State UniversityIntellectual Merit: This project investigates ultralow-threshold lasing of individual fused-silica microspheres coated with semiconductor quantum dots. The pump laser input and the microlaser emission are coupled in and out of the microsphere's whispering-gallery modes by tapered optical fibers. The objectives are to: (1) advance the understanding of microlaser operation, through studies of the origin of such low thresholds; (2) extend the range and controllability of microlaser operation - for example, increasing the 1240-1780-nm lasing wavelength range observed with HgTe and HgCdTe by varying the size and composition of the nanoparticles (also using PbSe and PbS); (3) further develop dielectrophoretic methods for controlled coating of microresonators with nanoparticles; and (4) demonstrate practical application of these microlasers - for example, the sensing of atmospheric trace gases such as methane or carbon monoxide. Three exciting new areas of research are resonant optical enhancement in microspheres; efficient optical emission from semiconductor nanoparticles; and directed assembly of nanoparticles into structures using dielectrophoresis. This work will advance fundamental research by facilitating studies of cavity quantum electrodynamics using quantum dots and whispering-gallery modes.Broader Impacts: This work will strengthen ties with the Oklahoma Network for Nanostructured Materials (NanoNet). The University's multidisciplinary Photonics degree program will also benefit from this project. Both the NanoNet and the Photonics program recruit students from underrepresented groups, and the PIs will encourage the participation of undergraduates. One co-PI and one graduate student are members of underrepresented groups. The graduate students involved will learn fundamental techniques as well as marketable skills. They will also be directly involved in dissemination of research results through conference presentations and journal publications. In addition to their fundamental interest, the microlasers also have numerous potential applications. The PI has a License Agreement with Nomadics, Inc., which is interested in developing commercial products based on the microlasers.